From f089cf9b2ff2602edd989480b7cd9d4b8b820f84 Mon Sep 17 00:00:00 2001 From: Manish Goregaokar Date: Mon, 18 Apr 2016 00:35:06 +0530 Subject: [PATCH] Update E0102's example (fixes #33057) --- src/librustc_typeck/diagnostics.rs | 33 ++++++------------------------ 1 file changed, 6 insertions(+), 27 deletions(-) diff --git a/src/librustc_typeck/diagnostics.rs b/src/librustc_typeck/diagnostics.rs index 1cfbfb37d34..ed74a5166d4 100644 --- a/src/librustc_typeck/diagnostics.rs +++ b/src/librustc_typeck/diagnostics.rs @@ -1420,45 +1420,24 @@ fn main() { "##, E0102: r##" -You hit this error because the compiler lacks information to -determine a type for this variable. Erroneous code example: +You hit this error because the compiler lacks the information to +determine the type of this variable. Erroneous code example: ```compile_fail -fn demo(devil: fn () -> !) { - let x: &_ = devil(); - // error: cannot determine a type for this local variable -} - -fn oh_no() -> ! { panic!("the devil is in the details") } - fn main() { - demo(oh_no); + // could be an array of anything + let x = []; // error: cannot determine a type for this local variable } ``` To solve this situation, constrain the type of the variable. Examples: -```no_run +``` #![allow(unused_variables)] -fn some_func(x: &u32) { - // some code -} - -fn demo(devil: fn () -> !) { - let x: &u32 = devil(); - // Here we defined the type at the variable creation - - let x: &_ = devil(); - some_func(x); - // Here, the type is determined by the function argument type -} - -fn oh_no() -> ! { panic!("the devil is in the details") } - fn main() { - demo(oh_no); + let x: [u8; 0] = []; } ``` "##,